Single cycle mechanism



mg. 9, 1955 J. L. MOODY arm. 2'714986 SINGLE CYCLE MECHANISM Filed Jan. 2. 1952 6 Sheets-Sheet 1 avmv L. M0005 004/ 5. secs;

IAN E RS Br A TORI/EV Aug. 9, 1955 J. L. MOODY ET AL 2,714,986

SINGLE CYCLE MECHANISM 6 Sheets-Sheet 2 Filed Jan. 2, 1952 JOHN 1.. MOODY 001V 5. GROBL 11w! mks Aug. 9, 1955 J. I oonv ET AL SINGLE CYCLE MECHANISM 6 Sheets-Sheet 3 Filed an. 2. 1952 Aug, 9 1955 J. 1.. MOODY ETAL SINGLE CYCLE MECHANISM 6 Sheets-Sheet 4 Filed Jan. 2 1952 JOHN L-MOODV ATTORNEY Aug. 9, 1955 J. L. MOODY ET AL 2,714,986

SINGLE CYCLE MECHANISM Filed Jan. 2. 6 Sheets-Sheet 5 JO/M L. M000) JON E. 0205 mfifoes 8% Zead Aug. 9, 1955 J. L- MOODY ETAL SINGLE CYCLE MECHANISM 6 Sheets-Sheet 6 Filed Jan. 2, 1952 JOHN L. MOODY JON E. snow.

lmiyrons av Q W A TORNEY United States Patent Office 2,7 14,98i Patented Aug. 9,

SINGLE CYCLE MECHANISM John L. Moody and .IouE. Grobl, Oakland, Call! ussignors to Friden Calculating Machine Co., Inc, a poration of California Application January 2, 1952, Serial No. 264,486

10 Claims. (Cl. 235-62) This invention relates to calculating machines, and particularly to a single cycle mechanism therefor.

One of the objects of the present invention is to provide an improved single cycle mechanism for a calculating machine of the type disclosed in the patent issued to Carl M. F. Friden on January 28, 1941, for Automatic Division, No. 2,229,890.

Another important object of the present invention is to provide a control mechanism for a calculating machine selectively operable to positively limit machine operation to a single cycle and separately condition the automatic keyboard clearing mechanism so that it will or will not operate simultaneously therewith.

in the past calculating machines have been provided with add key" mechanisms which were operative to limit the operation of the machine to a single cycle and to simultaneously clear the keyboard of the factor inserted therein. It has been conventional, in calculating machines heretofore marketed, to combine keyboard clearing with single cycle mechanism, so that the two always operated simultaneously, or neither was operated. While normally the automatic clearing of the keyboard is desirable when the machine is conditioned for single cycle operation, we have found that operation can be improved by separating the two mechanisms so that the single cycle mechanism can operate without automatic clearing of the keyboard, but with the control elements so arranged that normally both will be operated simultaneously. Thus, a further object of our invention is to provide an improved single cycle, nonclearing control for the calculating machine.

These and further objects of our invention will be evident from the following disclosure and claims in which:

Fig. l is a left elevation of the front part of one of the orders of the keyboard of the machine shown in the Friden patent above-mentioned, showing particularly the ordinal latching slide and the keyboard relcasing gate.

Fig. 2 is a left side view of the right-hand auxiliary, or control, plate showing particularly means for initiating additive or subtractive cycles of operation.

Fig. 3 is a right side view of the right-hand frame plate showing the clutch and drive mechanism and a portion of the means for limiting the machine operation to a single cycle.

Fig. 4 is a left side view of the right-hand frame plate showing other parts of the single cycle mechamsm.

Fig. 5 is a right side view of the right-hand frame plate, showing a modified form of the single cycle, nonclearing keyboard mechanism of the invention.

Fig. 6 is a left side view of the right-hand frame plate, showing other features of the mechanism shown in Fig. 5.

For purposes of disclosure the invention will be shown embodied in a machine of the type disclosed in the Patent No. 2,229,889 issued to Carl M. F. Friden on January 28, 1941. Those parts of the mechanism dis- I closed in the above patent associated with the mechs nism of this-invention are disclosed herein in order it show the environment of the new and novel structure Reference is to be had to the patent cited for a ful disclosure of these conventional mechanisms.

Value selection Selected values are entered into a calculator of th kind described by a conventional keyboard which in cludes a plurality of value keys (see Fig. 1). Th1 keys are mounted for substantially vertical movemen in the machine by means of a slot 101 in the key sten embracing a pair of parallel rods 1.2 rigidly supporter in a keyboard frame 103. The keys are resiliently urget to their raised position by means of a suitable sprinj 104, encompassing the key stem and seated againstthi upper plate of the keyboard frame 103 and the lowe: surface of the key top as shown. The key stem is former with an integral cam 105 and a notch 106 as shown it Fig. l.

Associated with the cam and notch of the key sten is an ordinal keyboard latch slide 110. The latch Slidt 110 is urged to its forward position by a suitable com pression spring seated between a turned over lip 113 am a crossbar 114 extending across the front of the ma chine. The latching slide 110 is provided withsuitabh slots 112 designed to cooperate with the cam 105 ant notch 1 of the various value keys of the particular order. Partial depression of a value key IOU-cause: the cam 105 to engage the rear edge of the associatet slot 112, through which the key stem extends, thereby forcing the latching slide 110 rearwardly against thj force of its spring 111. Such partial depression release: any key previously latched down. Complete depressior of the key 100 causes the lower edge of the notch 101 to pass below the latching slide 110, thereby permittinr the spring 111 to return the latching slide to its for: ward position. This locks the depressed key in its op erative position in which it remains until the latching slide is operated by moving it rearwardly to release the key. It is obvious that one means of so operatin the latching slide is through depression of another key in that same order.

The lower end of each key stem isprovided with t pin 107 extending laterally therefrom. .The pin 107 upon depression of the key 100, engages the cooperatini cam face 116 formed in the selection slide 118, thereby moving the slide 118 a ditferential amount determined by the angle of the cam face 116. It will be understood that it isconventional in selection mechanisms of this to form the cam faces 116 with progressively changing angles in order to secure differential translation of th selection slide 118. The movement of the selection slide 118 operates to set the selection mechanism, as is conventional in machines of this kind. I

A key which is latched in a depressed position may also be released by means of an ordinal clear,'or uro. key located in front of the ordinal row of'value keys 100. The zero, or ordinal clear, key 125 is mounted in the keyboard frame 103 in a manner similar to the value keys and is provided with a suitable compression spring 126 biasing it into its raised position. The key 125, like the value keys-100, extends downwardly through a slot 112 through the latching slide 110. The zero key 125 is formed with an enlarged cam face -121 which extends upwardly for a considerable distance along the edge of the key, and which omits the notch corresponding to the notch 106 in the value keys. The cam 121 corresponds to the cam faces 1.5 on the value key:

0 100 and is etiective, when the key is depressed, to force the latching slide 110 rearwardly, thereby releasing any value key latched in a depressed position.

Values latched in the keyboard may be cleared therefrom, simultaneously in all orders, by suitable clearing means such as depression of keyboard clear key 130 shown in Fig. 3.

The key 130 is mounted on the right-hand frame plate 145, for substantially vertical movement thereon, by suitable conventional means, such as slots 135 in the key embracing a pair of pins 136. The key is biased to its raised position by any suitable means, such as spring 137. The lower end of the key 130 engages a bellcrank 138, pivotally mounted on the frame plate 145 by any suitable means, such as screw 139. The bellcrank 138 is resiliently urged to its inoperative (counter-clockwise in Fig. 3) position by a suitable spring 140.

Clearance of the entire keyboard is secured by rocking a clearing bail 131 (Fig. 1) pivoted on a transverse shaft 132 and resiliently urged to its inoperative posi tion by a spring 142 (see Fig. 4). The bail 131 has a plurality of separate slides 90, one for each order of the keyboard, which slides respectively carry rearwardly extending projections 133 each normally adapted to engage the ear 113 on the forward end of the ordinally related latching slide 110. A pin 91 projecting forwardly from each slide, through an aperture, not shown, in the bail 131, provides an anchor for a corresponding spring 134 which biases the slides and projection to the upper, operative position of the projection. By referring to Fig. 1, it is obvious that rearward rocking of the bail 131 (counter-clockwise in this figure) causes the projections 133 to engage the corresponding downwardly extending lips 113 of each of the ordinal latching slides 110, thereby translating all of the slides 110 rearwardly. Such operation of the slides 110 causes the release of all of the keys locked in a depressed po sition, and thereby clears the keyboard. Depression of clear key 130 operates to rock the clearing bail 131 by means of the bellcrank 138, one arm of which engages an ear 141 on the right end of the bail 131.

Levers 92 are pivotally mounted intermediate their length on a shaft 93 disposed between, and parallel to, the bail shaft 132 and the transverse bracket 114, there being one such lever for each order of the keyboard. Each lever 92 has its forward end bearing upon a rearwardly directed flange, or lip, 94 at the lower end of the corresponding slide 90 and its rearward end bearing on a shoulder 95 provided on the corresponding key stem 96 near the lower end of the key stem. Each key stem 96 is also provided with a projection 97 located just below the corresponding key latching slide 110 when the 0 key is in its normal or intermediate position, as shown in Fig. 1.

A conventional detent 98 on each 0 key stem 96 normally restrains spring 126 from raising the 0" key above its normal, ineffective position, as shown in Fig. 1, but when subjected to upwardly directed manual force, permits the 0" key to be raised manually above its normal position to an upper locking position in which the 0 key constitutes an ordinal lock for the corresponding ordinal row of keyboard keys 100. At the location of the projection 97 the 0" key stem 96 has a width substantially as great as the length of the corresponding slot 112 in the associated latch slide 110 so that, when the 0 key is raised, the latch slide Cannot move to release a depressed keyboard key. Raising of a 0 key 125 also rocks the corresponding lever 92 to move the slide 90 and projection 133 of the same order downwardly to so position the projection 133 that it 'will not engage the down-turned lip 113 on the corresponding key latching slide 110 and attempt to move the slide to key releasing position.

If all of the 0" keys are raised, together they constitute a keyboard lock so that any factor or value in the keyboard is locked therein and cannot be changed until the lock is released.

Power operation The calculating machine with which our invention is illustrated is provided with a power drive which includes an electric motor, not shown. The armature shaft of the motor (see Fig. 3) extends through the right frame plate 145 and at its outer end carries a pinion 151. The pinion meshes with an idler gear 152 rotatably mounted on any suitable means, such as shaft 153. The idler 152 in turn meshes with a large drive gear 154. The large gear 154 is rotatably mounted on the power shaft 155 of the machine, and is provided with a ratchet wheel (not shown) rigidly secured to the inner side of the gear 154.

A clutch, designated generally at 160, comprises a ratchet wheel (not shown) rigidly secured to the large drive gear 154. The driven part of the clutch comprises a pair of plates 163 which are rigidly secured to the drive shaft 155. These plates are pinned together by means of pins (not shown). A clutch dog 161 is rotatably mounted between the plates and is urged into engagement with the ratchet wheel carried by gear 154 by means of a suitable spring (not shown). A clutch pawl 162 is provided with a nose which is adapted to engage the clutch dog 161 and rock it out of engagement with the ratchet wheel. The clutch pawl 162 is pivotally mounted on the frame plate 145 by any suitable means such as screw 170. Preferably the clutch is provided with means which will hold the clutch pawl 162 out of engagement with the clutch dog 161 throughout the major portion of a cycle of operation, which means may include the conventional roller 164 mounted on the clutch pawl 162 and lying in a depression 169 of one of the plates 163 when the clutch is in the full cycle position shown. Rocking of the pawl 162 to permit engagement of the clutch dog 161 with the teeth of the cooperating ratchet wheel, causes rotation of the plates 163, whereby the periphery of the plate 163 engages the roller 164 and holds the pawl in the disengaging position until near the end of a full cycle of operation, when the roller can again drop into the depression 169 unless prevented from rocking by some outside means.

on a two-armed lever 166. The two-armed lever 166 is pivotally mounted or-. the frame plate 145 by any suitable means such as screw 167. The lower end of the lever 166 is secured to the switch control link 168 which extends rearwardly to a suitable switch for controlling operation of the motor. By this means the motor is driven and the clutch operated simultaneously. i. e., the motor is energized only when the clutch is engaged. The operation of the clutch control link and the lever 166 is under the control of a forwardly extending control link which is pivotally secured to the link 165 and lever 166. The control link 175 is biased to its forward and lower position by a suitable spring 176 tensioned between an ear on the control link 175 and a stud on the support plate 145. This spring resiliently forces the clutch pawl 162 to its blocking position, thereby disengaging the clutch, and the switch link 168 rearwardly to open the motor switch. The forward end of the control link 175 is bifurcated, or slotted, as shown at 177. The slot 177 embraces a pin 253 mounted on a rocking member 252, the operation of which will hereinafter be described. By the construction shown the control link 175 can be rocked clockwise about its pivotal connection with the link 165 and lever 166, but is normally urged to the lower position shown in Fig. 3 by the spring 176. I

The link 175 is also provided with a lateral notch 178 in its lower edge, which slot embraces a pin 179. The pin 179 is rigidly mounted on the digitation control slide 180. shown in Fig. 2. The digitation control slide 180 is mounted for substantially horizontal movement on the auxiliary, or control, plate 146 as shown, the control plate 146 lying to the right of frame plate 145. The slide 180 is normally urged to its forward position by suitable spring 186, but can be translated rearwardly to initiate operation of the motor and to cause engagement of the clutch, by various control mechanisms, such as plus bar 181, subtraction key 182, or the bellcrank 183 which is rocked counter-clockwise upon the initiation of a division operation. The keys 181 and 182 are operable to translate the slide 180 by means of the pins 184 carried thereby, engaging the cam slots 185 formed in the slide 180. it is thus obvious that depression of the control keys181 or 182 is operative to translate the slide 180 rearwardly, carrying with it the pin 179. The pin, being embraced within the notch 178 of the control link 175, forces that link rearwardly and thereby translates link 165 to cause engagement of the clutch and rocks lever 166 to cause energization of the motor. In such operating conditions, the motor will continue energized and the clutch continue engaged as long as either of these keys are held depressed.

In many instances however, it is desirable to condition the machine for single cycle operation, so that regardless of the depression of the control keys, the machine will be limited to a single cycle of operation. That is, at the end of each cycle of operation the clutch will be automatically disengaged and the motor will be automatically stopped. It is conventional in calculating machines of this kind to provide an add key which is operative, when set to proper position, to limit the machine to a single cycle even though a control key is held depressed and to automatically release the keyboard setting toward the end of a single cycle of operation. It is a purpose of our invention to modify conventional mechanisms to provide selective means for selectively disabling the keyboard clearing mechanism while the single cycle means is operative; thus limiting the machine to single cycle operation while maintaining a keyboard value through a number of cycles of operation. 1

Single cycle operation The control link 175 is conditioned for single cycle or multicycle operation by any suitable means, such as add key 190. This key is shown as pivotally mounted on the frame plate 145 by suitable means, such as screw 191. The add key is provided with suitable detent notches 192 which are engaged by the nose of a detent 193. The detent is rocked into engagement with the notches 192 by any suitable biasing means, such as spring 194 tensioned between an ear on the detent member 192 and an ear on the add key lever 190. A forwardly extendinglink 195 has its rear end pivotally secured to the add" key lever 190, and its forward end pivotally mounted on a bellcrank 196. The bellcrank is pivotally mounted on the frame plate 145 by any suitable means, such as pin 197. The other arm of the bellcrank 196 is formed into a nose 198 which is embraced in a slot 206 of slide 205.

The slide 205 is mounted for vertical movement on the frame plate 145 by any suitable means, such as a pair of slots 207 in the slide embracing suitable studs 208. The slide 205 carries a pin 209 which extends through an aperture 210 in the frame plate 145. As shown in Fig. 4, the pin 209 is embraced within a slot 212 formed in long link 211. The long link 211 is pivotally mounted at its rear end on a two-armed lever 213 pivoted to the frame plate by any suitable means, such as shaft 214. The lever is urged in a clockwise direction, and the link is urged forwardly, by a suitable spring 215 tensioned between the lever and a stud on the frame plate 145. The forward end of the long link is provided with a cam face 217 which cooperates with a roller 216 mounted on the frame plate. Thus when the slide 205 is lowered, rocking the forward end of the long link 211 downwardly, the spring 215 translates the link forwardly under the roller 216, whereby a notch 218 formed on the underside of rearwardly, rocking the lever 213 counter-clockwise When the lever 213 is in its clockwise position the lower end is cyclically engaged by a pin 219 mounted on a plate 220 rigidly secured to the drive shaft 155. In this condi tion the lever 213 is rocked counter-clockwise once it each cycle of machine operation, the rocking occurring immediately before the plate and clutch 160 return to thc full-cycle position. Such rocking pulls the link 21 1 an: the pin 225 rearwardly. However, when the lever 213 is in the counter-clockwise position shown in Fig.4, the lower end of the lever will just clear the pin 219, so thal the mechanism is not rocked, but even if it were it would be inoperative to rock the bellcrank 226 as the notch 218 i: disengaged from the pin 225. It is thus evident that the position of the add" key 190 controls the operation 0! link 211, and through it the rocking of the bellcrank 226 Associated with the bellcrank 226 is an arm 250, preferably mounted on the left-hand side of the frame plate as shown in Fig. 4. This arm 250 is pivotally mounted on any suitable means such as the stud 208 which also supports the slide 205 for vertical translation. The arm 251 is provided with an edge 251 adapted to be engaged by the pin 225 upon the rocking of the link 211 and bellcrank 226, thereby rocking arm 250 also. The upper end 01 arm 250 normally abuts an arm 252 pivotally mountec on the shaft 227. This arm 252 carries the pin 253 above mentioned, which also extends through the aperture 210 It will be recalled that the pin 2521 supports the forwarc end of the control link 175. When the single cycle mech anism is set in its operative position and the machine cycled, the translation of link 211 at the end of a machine cyclerocks the arm 252, and its integral pin 253 to lift control link to disengage the notch 178 in the control link from the pin 179 mounted on the plus-minus bar. The disengagement of the pin and notch 179, 178 permits the spring 176 to snap the control link forwardly, there by rocking clutch pawl 162 to its disengaging position and rocking lever 166 counter-clockwise to open the motor control switch. This stops operation of the machine at the end of each cycle of operation even though the digitation control key 181 or 182 is held depressed. Once the control link 175 is lifted above the pin 179 the lower edge of the link 175 will ride upon the pin 179 until the digitation control slide 180 is returned to its normal po sition. Thus the machine can be given single cycles 01 operation and cannot again be operated until the digitation control key 181 ,or 182 is permitted to rise and is again depressed by manipulation of the operator.

It will be noted that by means of the mechanism shown, the operation of the single cycle or add key 190, by rocking it to its forward position, invariably limits the operation of the machine to a single cycle. Normally, in this embodiment, the mechanism also operates to clear the keyboard simultaneously with the stopping of the machine at the end of the cycle of operation.

Automatic clearing Normally the keyboard will be cleared with each cycle of single cycle operation, the clearing and single cycle operations occurring simultaneously and from the same basic mechanism. The mechanism for automatic clearing of the keyboard is shown particularly in Fig. 3. As shown in this figure, the bellcrank 226 is pivotally mounted on the frame plate 145 by any suitable means, such as shaft 227. The other arm of the bellcrank 226 normally abuts against a stop 228 mounted on the frame plate. The vertical arm of the bellcrank 226 carries a clear link 229 pivotally mounted thereon by any suitable means, such as stud 230. The link 229 extends forwardly to a point adjacent the ear 141 on the right-hand end or the clear bail 131, the link having an integral, reversibly bent nose 231 which is adapted to engage the car 141 and thus rock the clear bail upon translation of the link. The link is normally urged in an engaging direction, clockwise as viewed in Fig. 3, to engage the car 141 by any suitable resilient means, such as spring 232. it is thus obvious that normally, when the add key 190 is in its forward or operative position, which lowers the link 211 to engage the pin 225, the clear link 229 will be pulled rearwardly to rock the clear bail 131 substantially at the end of each cycle of operation. By this means, when desired, the keyboard can be cleared with each cycle of operation.

Non-clear control Engagement of the nose 231 of the clear link 229 with the car 141 of the clear bail 131 can be blocked by any suitable means. thus preventing the clearing of the keyboard with each cycle of operation even though the add key 190 is in its forward position. A preferred means is shown in Fig. 3 and comprises a non-clear key 240 mounted for vertical movement on the frame plate 145. The key 240 is urged to its raised position by means of a suitable spring 241 tensioned between a stud on the lower end of the key stem and a crossbar, as shown. The non-clear key 240 can be latched in its depressed position by suitable means, such as an car 242 formed on the key stem which is engaged by a latch shoulder 243 formed on the vertical arm of the bellcrank 138. The bellcrank 138 is normally rocked to its counter-clockwise position by spring 140 previously mentioned, so that the bellcrank 138 latches the key 240 in its depressed position. The key 240 can be released by the clockwise rocking of bellcrank 138. which is caused by the depression of the keyboard clear key 130 previously mentioned.

The non-clear key 240 has an integral nose 245 lying immediately above the horizontal portion of the reversibly bent car 231 of clear link 229. Depression of key 240 rocks the forward end of the clear link downwardly so that the ear 231 will travel in a path below the car 141 on clearing bail 131. In this manner the reciprocation of link 229 can be prevented from rocking clearing bail 131.

It is obvious that the operation of the keyboard clearing mechanism can be blocked by the depression of the nonclcar key 240, even though the single cycle mechanism is set for single cycle control of machine operation. Thus. the keyboard value is retained in the keyboard but the keys thereof can be changed if desired by the operator by merely depressing another value key 100 in any of the orders in which it is desired to change a value.

Second form A second embodiment is essentially the equivalent of the forms shown in Figs. 1 to 4, inclusive. In this embodiment, however, the mechanism is modified to provide two control keys. preferably immediately adjacent each other and operable by a single finger stroke of the operator. One of these keys is designed to set the single cycle mechanism in its operative position and the other is to set the automatic keyboard clearing mechanism in an operable position. As the two keys are preferably immediately adjacent each other. they normally will be operated together. However. the single cycle key can be set to condition the machine for single cycle operation, without changing the setting of the keyboard clearing mechanism. The mechanism of this embodiment is shown in Figs. and 6, in which the various parts have the same reference characters as in the preceding embodiment if they are identical with those of the other form.

As indicated, this embodiment has two control keys, that is, the single cycle control key 290 and the automatic keyboard clear control key 300 located immediately adjacent each other and preferably both are rotatably mounted on the same screw 191. Both operating arms are provided with detent notches 292 which are engaged by respective detents 293, spring-urged to engaging position by suitable springs 294. The single cycle control link 295 is pivotally mounted to the single cycle control key lever 290 and is essentially the same as the corresponding link 195 in the other embodiment. This link is pivotally secured to the bellcrank 196 which operates the slide 205 and link 211 as in the previous form. The link 211 can selectively engage the pin 225 on the bellcrank 226, upon which is pivotally secured the automatic keyboard clearing control link 229 which is normally urged into its raised. or operative position by a suitable spring 232. Rocking of the bellcrank 226 is effective to cause rocking of the arm 250, which in turn rocks the arm 252. Rocking of the arm 252 causes its pin 253 to lift the clutch control link 175 from its engagement with the pin 179 on the digitation operating slide (not shown in these figures). Thus, the continued depression of the plus-minus keys, when the single cycle control arm 290 is in its forward position, causes energization of motor and engagement of the clutch for a single cycle operation, the control link being positively lifted from its operative position toward the end of that cycle, whereby the clutch may become disengaged and the motor stopped at the end of the cycle.

As indicated above, a keyboard control key 300 is mounted immediately adjacent the single cycle control lever 290, preferably in such a manner as to be operated by the same single finger stroke that sets the single cycle key 290. In the preferred form the clearing control lever 300 is provided with a pin 301, as shown in Fig. 5. Associated with the control lever 300 is a two-armed lever 302 which is pivotally mounted on the frame plate by any suitable means, such as stud 303. The rear end of this link is provided with a cam edge 304, associated with the pin 301, so that when the arm 300 is rocked forwardly the pin 301 earns the rear end of the lever 302 upwardly (in a counter-clockwise direction when viewed from the right as in Fig. 5). The forward end of this lever 302 is provided with a pin, or stud, 305, which obviously rocks downwardly when the lever 302 is operated by the forward rocking of the control arm 300. In this embodiment the single cycle control link 295 is provided with a forwardly reaching extension 310 integral therewith. A latching arm 311 is pivotally secured to the forward end of the extension 310 by any suitable means, such as rivet 312. This latching arm is normally urged to its raised position by a suitable spring 313 tensioned between studs on the link 295 and the arm 311, as shown in Fig. 5. This arm is provided with a shoulder 314, as shown in Fig. 6.

The latching shoulder 314 normally engages a pin 321 mounted on the upper end of a clear control bellcrank 320 which is pivotally mounted on the frame plate 145 by a suitable stud 324. The bellcrank 320 has a forwardly and downwardly extending arm provided with a nose 322 normally engaging a roller 323 mounted on the keyboard clearing control link 229.

It will be obvious that when the single cycle control lever 290 is rocked forwardly, translating the link 295 forwardly to set the single cycle control mechanism as above described, the latching arm 311 (being urged upwardly by its spring) will engage the pin 321 and rock the bellcrank 320 forwardly (counter-clockwise in Fig. 5). The rocking of the bellcrank 320 forwardly causes the nose 322 thereof to engage the roller 323 and rock the keyboard clear control link 229 downwardly out of engagement with the car 141 on the clearing bail. Thus the rocking of the lever 290 alone causes the single cycle mechanism to operate, but positively causes the keyboard clearing mechanism to be disengaged. However, when the two levers 290 and 300 are rocked simultaneously, the forward movement of the lever 300 rocks the lever 302. Rocking of the lever 302 causes the pin thereon to rock the latching arm 311 against the tension of its spring so that the shoulder 314 thereon is forced below the pin 321. In this instance the bellcrank 320 is not rocked,

F thereby enabling the spring 232 to hold the control link 9 r 229 in its raised or operative position (and also hold the bellcrank 320 in its clockwise position shown in Fig. This enables the single cycle mechanism to automatically clear the keyboard at the end of each cycle of operation.

By the means shown, the machine can selectively be set for multicycle operation in which the machine operates as long as one of the digitation control keys 181 or 182 are held depressed, or it can be conditioned for single cycle operation. In the latter event the mechanism invariably limits the operation to a single cycle, but the operator can control whether or not the keyboard is to be cleared with each cycle. In the first form described the mechanism operated to cause the single cycle mechanism and the keyboard clearing mechanism to normally operate together, but provided means whereby the keyboard clearing mechanism could be disengaged from the single cycle mechanism. In the second form, operation of the single cycle control mechanism normally is operative to disengage the automatic keyboard clearing mechanism, but it is provided with means, preferably operated by the same finger movement that set the single cycle control, to supersede the disengagement of the clearing mechanism. Both forms enable the operator to selectively provide single cycle operation of the machine, with or without automatic clearing of the keyboard.

We claim:

1. ln a cyclic calculating machine having a selection mechanism in which a factor may be entered, a latch for said selection mechanism, a latch releasing means, power means, a clutch operatively connecting said power means to said machine, apower operated single-cycle mechanism selectively operative to disengage said clutch at the end v of each cycle of machine operation, a manually operated control member for selectively positioning said single cycle mechanism in either its operative or its inoperative position, yieldable connecting means adapted to connect said latch releasing means to said single cycle mechanism, and a manually positioned means controlling the operation of said connecting means.

2. The apparatus of claim 1 in which said connecting means is biased to connecting position and said manually positioned means is operable to disable said connecting means.

3. The apparatus of claim 1 in which said connecting means is normally disabled by said single-cycle mechanism and said manually positioned means is operable to enable said connecting means.

4. In a cyclic calculating machine having a selection mechanism in which a factor may be entered, a latching means for said selection mechanism, a latch releasing means, power means, a clutch operatively connecting said power means to said machine, a power operated singlecycle mechanism selectively operative to disengage said clutch at the end of each cycle of machine operation, a manually operated control member for selectively positioning said single cycle mechanism in either its operative or its inoperative position, yieldable means normally connecting said latch releasing means to said single cycle means, and manually controlled means for moving said yieldable means to a disengaged position.

5. In a calculating machine having a selection mechanism in which a factor is set and latched, a selection mechanism releasing means, a single cycle mechanism including power operated means for limiting machine opera tion to a single cycle, a first member selectively operable to condition said single cycle mechanism for operation with each cycle of machine operation, connecting means for operatively connecting said releasing means to said single cycle mechanism, resilient means associated with said member for preventing said connecting means from operating said releasing means upon operation of said single cycle mechanism, and a second member laterally adjacent to said first member and operable simultaneously therewith for positioning said resilient means in an inoperative position and thereby enable simultaneous opera- 10 tion of said releasing means withsaid single cycle mechamsm.

6. In a cyclic calculating machine having a power means, a clutch operatively connecting said power means to said machine, a selection mechanism in which a factor may be entered, a latching means for said selection mechanism, a power operated single cycle mechanism selectively operative to disengage said clutch at the end of each cycle of machine operation, a manually operated control member for selectively positioning said single cycle mechanism in either its operative or its inoperative position, a latch releasing means selectively operative from operation of said single cycle mechanism to release said latching means, means yieldably biasing said latch releasing means from operation by said single cycle mechanism, and a second manually controlled member operable simultaneously with said first control member to operatively connect said latch releasing means to said single cycle mechanism.

7. In a calculating machine having selection mechanism in which a factor can be manually entered, latch means for releasably latching said selection mechanism, power means, a clutch effective to connect said power means to said machine for successive operating cycles of the machine, single cycle mechanism driven by said power means and elfective when in operative condition to control said clutch to limit machine operation to separate operating cycles and when in inoperative condition to free said clutch for continuously successive operating cycles of the machine, a manually operated control means effective to determine the operative or inoperative condition of said single cycle mechanism, latch releasing means effective when actuated to release said latch means, connecting means adapted to connect said single cycle mechanism to said latch releasing means to release said latch means at the end of each machine operating cycle when said single cycle mechanism is in operative condition, manually positionable means acting upon said connecting means and effective to enable-and disable said connecting means.

8. In a calculating machine having selection mechanism including ordinally arranged digit keys depressible to enter a factor in said selection mechanism and latch means effective to releasably latch depressed keys in depressed position, key release means effective when actuated to release said latch means, cyclically operable power means effective to drive the machine, control means effective when actuated to enable said power means, single cycle mechanism effective when operative to limit operation of said power means enabled by actuation of a control means to a single cycle, manually movable means effective to render said single cycle mechanism operative or inoperative to limit operation of said power means to a single cycle, and mechanism connected to said key release means and rendered effective by the operative conditioning of said single-cycle mechanism to actuate said key release means during each single-cycle operation of the machine; manually settable means movable to an operative position in which it disables said mechanism connected to said key release means, and means retaining said manually settable means in operative position until manually released therefrom.

9. In a calculating machine having power means, mechanism releasably connecting said power means to the machine for cyclic operation of the latter, a selection mechanism in which a factor may be manually entered, latch means effective to releasably latch said selection mechanism, latch releasing means, power operated single-cycle mechanism operative to release the releasable connecting mechanism at the end of each machine operating cycle. manually operated control means to selectively render said single-cycle mechanism etfective or ineffective to control single-cycle operation of said machine, connecting means adapted to connect said single-cycle mechanism to said latch releasing means to release said latch means during each machine operating cycle while said single-cycle mechanism is effective. and means yieldably holding said con- 1 necting means in effective connecting position; manually settable control means acting upon said connecting means to render the latter effective or ineffective to connect said single-cycle mechanism to said latch releasing means.

10. In a calculating machine having power means, mechanism releasably connecting said power means to the machine for cyclic operation of the latter, a selection mechanism in which a factor may be manually entered, latch means effective to releasably latch said selection mechanism, latch releasing means, locking means effective to lock said selection mechanism to maintain an entered value therein, power operated single-cycle mechanism operative to release the releasable connecting mechanism at the end of each machine operating cycle, manually operated control means to selectively render said singlecycle mechanism effective or ineffective to control singlecycle operation of said machine, and connecting means conditioned by said manually operated control means when the latter is moved to place said single-cycle mechanism in operation to operate said latch releasing means to release said latch means during each machine operating cycle while said single-cycle mechanism is effective; manually settable control means acting upon said connecting means to render said connecting means effective or ineffective to connect said single-cycle mechanism to said latch releasing means for the release of an entered factor from said selection mechanism when said connecting means is efiective and the maintaining of such factor in the selection mechanism independently of said locking means when said connecting means is ineifective.

References Cited in the file of this patent UNITED STATES PATENTS 1,432,616 Phinney Oct. 17, 1922 1,849,349 Friden Mar. 15, 1932 2,046,820 Hilder July 7, 1936 2,160,361 Hilder May 30, 1939 2,391,089 Friden Dec. 18, 1945 2,470,300 Gang May 17, 1949 2,531,206 Gang Nov. 21, 1950 

